Surging 9n3 GTi Under wot

[FLOSPOLOGTI]

hi guys. still surging...noticed more (albeit only due to being only gear really able to test within open road speed limits) when fully or almost fully flooring accelerator say from 3000rpm mark and expecting it to pull cleanly post initial full boost comes on. Boost comes on great (APR V2, GFB dv and N75J) - no boost gauge - i.e. initially pulls great, but then as speed builds, starts fluctuating the rate of acceleration. If you didn't know better, you'd think I was deliberately slightly backing off on the accelerator, back on, then off etc. For those who have experienced this - what was the fix??

[Blue9N3]

Mine does the same. Has stopped doing it recently. Don't know why. Maybe hot weather?


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[seangti]

Do you have access to VCDS to scan for faults and log the car? I'm typing this from a phone so can't see your location, put a shout out here or in the VCDS section of the forum for assistance, or go see the APR distributor if they will to check over it.

Do a full scan of the ECU then log it. By logging boost (actual and requested), MAF, AFR (actual and requested), should give some indication as to what's going on. I assume you haven't been fiddling with any other tune/ECU related software to adjust timing or anything.

[sambb]

there was a whole thread on this somewhere in the search facility. It was something about different versions of APR being more prone to it than others or something along those lines. I can't remember if the thread ever came to a conclusion on anything but it might give you a few ideas on things or people to call?

[seangti]

Could be that vvt is activated on WOT on the version 2 tune, that would give the effect you've described. I have no idea if APR have done that on their tunes though, an other than asking APR, don't know how you'd validate.